/**
 * Copyright (C) 2017 - 2020 https://github.com/joewee
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.bifrost.workflow.price;

import com.bifrost.entity.Order;
import com.bifrost.entity.OrderItem;
import com.bifrost.exception.PricingException;
import com.bifrost.workflow.BaseActivity;
import com.bifrost.workflow.ProcessContext;
import org.springframework.stereotype.Component;

import java.math.BigDecimal;
import java.util.List;

/**
 * 计算商品小计
 *
 * @author joewee
 * @version 1.0.0
 * @Date 2017/11/14 15:55
 */
@Component("itemActivity")
public class ItemActivity extends BaseActivity<ProcessContext<Order>> {

    public static final int ORDER = 1000;

    public ItemActivity() {
        setOrder(ORDER);
    }

    @Override
    public ProcessContext<Order> execute(ProcessContext<Order> context) throws Exception {
        Order order = context.getSeedData();
        List<OrderItem> items = order.getOrderItems();
        if (items == null || items.isEmpty()) {
            throw new PricingException("无效的订单项目");
        }
        BigDecimal total = BigDecimal.ZERO;
        for (OrderItem item : items) {
            Integer quantity = item.getSkuQuantity();
            BigDecimal price = item.getSkuPrice();
            if (quantity == null || quantity.compareTo(0) <= 0 || price == null || price.compareTo(BigDecimal.ZERO) <= 0) {
                throw new PricingException("无效的订单项目:" + item.getSkuId());
            }
            total = total.add(item.getSkuPrice().multiply(BigDecimal.valueOf(item.getSkuQuantity())));
        }
        if (total.compareTo(BigDecimal.ZERO) <= 0) {
            throw new PricingException("商品小计计算异常");
        }
        order.setSubTotal(total);
        return context;
    }
}
